Downgrade from Official 2.2 Froyo to Stock 2.1

So, on my Motorola Droid. I was rooted on unofficial 2.1 then decided to unroot, HARD reset my phone wipe everything and start fresh to download the newly released manual update for Froyo 2.2!

I downloaded, installed it and all that good stuff. Now I'm wondering about how to downgrade from Official 2.2 to Official 2.1-update1 because I want to root once back on Stock 2.1 to Pete's rooted Froyo 2.2 ROM!

i am interested in doing it too, the speaker is going out on me, and i need to get a replacement phone. i would not like to get caught with a hacked system, so i am gonna need to go back to 2.1 also. easy root should do this?

OK, I have a few questions.
1. you download the file and rename it to update.zip, and boot into recovery and install it like if you were installing a new rom right?

2. Does this change the bootloader back to what it was before SPRecovery?

3. And finally if I were to downgrade from my rom to stock 2.1 and OTA 2.2, will I be able to just boot back into recovery and load my custom rom again, or will I need to re-root the phone again?

Sorry for such newb questions. I like the rom I am running, but to be honest I wouldn't mind waiting to see when I would get the actual OTA update. And go though the whole process. Just so I can say I have done it.

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